Abstract
A high-conductivity solid electrolyte, La2Zr2O7 (LZO) added to Li6.4La3Zr1.4Ta0.6O12 (LLZTO), was prepared via conventional solid-state reactions and sintered at 1100°C for 10 h, which is tens of Celsius degrees lower than the typical sintering temperature for LLZTO. The addition of LZO did not bring in any impurities. LZO acted as a sintering aid to densify the LLZTO from a relative density of 77% up to 90%, which was comparable to that of pure LLZTO sintered at 1200°C. The 6 wt.% LZO–LLZTO samples sintered at 1100°C and 1200°C exhibited a room-temperature conductivity of 1.92 × 10−4 S/cm and 5.84 × 10−4 S/cm, respectively, which were higher than that of pure LLZTO samples. Glass-like phases observed at grain boundaries in LZO–LLZTO ceramics indicated that LZO promoted the formation of the glass-like phases binding together LLZTO grains and thus leading to enhanced density and conductivity of LLZTO.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China under Grant Nos. 51432010, 51372262 and fundamental research project from the Science and Technology Commission of Shanghai Municipality No. 14JC1493000. We thank Prof. B.V.R. Chowdari (School of Materials Science and Engineering, Nanyang Technological University) for helpful discussion.
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Huang, X., Shen, C., Rui, K. et al. Influence of La2Zr2O7 Additive on Densification and Li+ Conductivity for Ta-Doped Li7La3Zr2O12 Garnet. JOM 68, 2593–2600 (2016). https://doi.org/10.1007/s11837-016-2065-0
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DOI: https://doi.org/10.1007/s11837-016-2065-0